|Publication number||US4710372 A|
|Application number||US 06/911,426|
|Publication date||Dec 1, 1987|
|Filing date||Sep 25, 1986|
|Priority date||May 18, 1984|
|Also published as||CA1254150A, CA1254150A1, EP0165454A2, EP0165454A3, EP0165454B1, US4634589|
|Publication number||06911426, 911426, US 4710372 A, US 4710372A, US-A-4710372, US4710372 A, US4710372A|
|Original Assignee||Wurttembergische Parfumerie-Fabrik Gmbh|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Non-Patent Citations (2), Referenced by (28), Classifications (11), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of Ser. No. 731,286, filed May 7, 1985, now U.S. Pat. No. 4,634,509.
The present invention relates to a dentifrice for hypersensitive teeth containing an apatite having an average particle size of less than 10 μm and, optionally, a local anesthetic.
German Patent Specification No. 21 34 862 describes dentrifrices for hypersensitive teeth. However, the dentifrice recipes additionally contained an osmotically effective salt combination comprising sodium hydrogencarbonate, sodium chloride, magnesium carbonate, magnesium chloride, potassium sulfate, etc.
U.S. Pat. No. 3,122,483 discloses adding strontium chloride to dentifrices, since this substance is believed to influence the stimulus conduction in the pulp. From the view of dental medicine influencing the pulp is hardly desired and may invlove other negative consequences.
A further means for treating hypersensitivities is by local application of amine fluoride solutions. However, this treatment has the drawback of that it can only be carried out in the dentist's office, and, with conventional dental care, will only last for a short time.
Extensive experimental work directed to improving the commercial product described in the German Patent Specification No. 21 34 862 has led to the surprising result that the addition of strontium chloride did not improve the effect. Rather, it was found that the efficacy could be improved to a significant extent by omitting all soluble mineral salts and employing an apatite having an average particle size of less than 8 μm as the sole crystalline and polishing substance. Moreover, such an apatite has an substantially lower abrasion value (measured as RDA; cf. Radioactive Dentine Abrasion, J. J. Hefferren, J. Dental Research 55, No. 4, 563-573 (1976)) of less than 30. The amount of the apatite used must be higher than that of the commercial product, namely at least 15% by weight instead of 9% as used in commercial products to date.
These results were not foreseeable and also cannot be readily interpreted afterwards. However, the findings suggest that there is some polishing effect. Namely, in the course of polishing there is always formed a continuous vitreous glossy layer at the tooth surface, which layer consists of the base substance of the polished material, on the one hand, and of the polishing agent, on the other hand. In the polishing procedure these two (the base substance and the polishing agent) are closely mechanically attached to each other and fused. Thus, the polishing agent is mechanically rubbed in between the microscopic microcrystalline to atomic unevennesses and roughnesses of the surface and fused with same due to local overheating and formation of an eutectic mixture. If this concept is transferred to the tooth surface, then this could mean that by treatment with large amounts of the finely-divided apatite, the latter is pressed into the exposed small dentin channels. Since the material is the same as that of the hard substance of the tooth, the existing damages can heal if no interfering alien minerals will inhibit the fusion process. Furthermore, the amount of offered apatite must be large enough, and care must be taken to prevent the polished surface being torn open again and destroyed by other abrasive materials.
Further investigations have shown that an increased remineralization occurs, more specifically so with particle sizes of the apatite of less than 4 μm . After 20 applications in vitro, there was already observed a reduction in diameter of the dentin channels by about 50%.
Independently of this subsequent theoretical explanation, it has been established that the desired effect is obtained only if all of the conditions according to the present invention have been fulfilled.
Thus, it is the object of the present invention to provide a dentifrice for hypersensitive teeth containing an apatite having an average particle size of less than 10 μm and optionally a local anesthetic, which dentifrice is characterized in that it contains an amount at least 15% by weight of an apatite having an average particle size of less than 8 μm and an abrasion value (RDA) of less than 30 as the sole crystalline and polishing substance, no further soluble mineral salts being present.
The apatite to be used in the present invention may be hydroxylapatite, fluoroapatite, or a mixture thereof. It is essential that the amount, particle size, and abrasion value will be observed and maintained and that no other soluble mineral salts can exert any interfering effect.
Silicic acid has been proven to be a non-interfering substance which can be added in an amount of up to 10% by weight without adversely affecting the efficacy of the dentifrice.
The dentifrices according to the present invention of course may additionally contain a local anesthetic such as benzocain, p-aminobenzoic acid ethylester. In addition to glycerol and water, the dentifrices according to the present invention further contain wetting and foaming agents, flavoring agents, and aroma ingredients. If desired, any other additive may be used as long as it is not a soluble mineral salt.
The apatite used in the present invention and having an average particle size of less than 8 μm and an abrasion value (RDA) of less than 30 is known in the art as so-called amorphous hydroxylapatite, fluoroapatite or a mixture thereof. The bulk density of the apatite is preferably less than 180 g/l and mostly in the range of around 150 g/l.
The dentifrice according to the present invention is further illustrated by the following Example and Comparative Examples and Abrasion Tests.
______________________________________Amorphous silicic acid Aerosil 200 2.40%Carboxymethylcellulose 1.00%Sodium laurylsulfate 2.75%Glycerol (99%) 20.80%Wetting agent (Hostapon KTW) 0.90%p-Hydroxybenzoic acid methylester-Na 0.20%Saccharin-Na 0.25%Tricalcium hydroxylapatite 17.00%Water 50.699%S-Erythrosin 76 E 127 0.001%Aroma 1.50%Propylene glycol 2.50%______________________________________
The tooth-paste consisting of the above components was subjected to the abrasion test (RDA). The abrasion value was found to be 24.
Clinical examinations of this tooth-paste showed a significant improvement already after 3 to 8 days, and all of the users were found to be pain-free after 15 days at the latest.
For comparison, the formulations according to the recipes B through G as set forth in the following Table were prepared.
TABLE__________________________________________________________________________ B C D E F G__________________________________________________________________________Amorphous silicic acid Aerosil 200 3.00 2.85 10.00 3.00 2.40 2.40Carboxymethylcellulose 1.00 1.00 1.00 1.00 1.00 1.00Sodium laurylsulfate 2.75 2.75 2.75 2.75 2.75 2.75Glycerol (99%) 20.80 20.80 20.80 20.80 20.80 20.80Wetting agent (Hostapon KTW) 0.90 0.90 0.90 0.90 0.90 0.90p-Hydroxybenzoic acid methylester-Na 0.20 0.20 0.20 0.20 0.20 0.20Saccharin-Na 0.25 0.25 0.25 0.25 0.25 0.25Tricalcium hydroxylapatite -- -- -- 9.00 17.00 17.00Water 49.499 49.499 60.99 49.499 44.699 44.699S--Erythrosin 76 E 127 0.001 0.001 0.001 0.001 0.001 0.001Aroma 1.50 1.50 1.50 1.50 1.50 1.50Propylene glycol 2.50 2.375 2.50 2.375 2.50 2.50Potassium sulfate 0.175 -- -- 0.175 -- --Magnesium carbonate 1.25 -- -- 1.25 -- --Sodium hydrogencarbonate 6.25 -- -- 6.25 -- --Sodium chloride 0.175 -- -- 0.175 -- --Titanium dioxide 0.75 0.75 -- 0.75 -- --Dicalcium phosphate × 2 H2 O 9.00 17.00 -- -- -- --Benzocain -- 0.125 -- 0.125 -- --Strontium chloride × 6 H2 O -- -- -- -- 6.00 5.00Cetylamine hydrogenfluoride -- -- -- -- -- 1.00__________________________________________________________________________
Recipe E conforms to that of the commerical product of German Patent Specification No. 21 34 862. Recipe B conforms to that of the commercial product of Recipe E; however, Recipe B does not contain hydroxyl apatite. Recipe C conforms to Recipe B, but contains benzocain added thereto. Recipe D is a placebo containing no active ingredient at all. Recipes F and G conform to Recipe A according to the invention; however they additionally contain strontium chloride×6 H2 O or cetylamine hydrogenfluoride, respectively.
As a result of the clinical examination, Recipe A (a dentifrice according to the present invention) was found to be substantially more efficient than the commercial product and some other recipes, although the latter were superior to the placebo.
The abrasion values (RDA) were determined of the materials according to Recipes A and F and of some known commercial products. It was determined that the abrasion value of Recipe F was already 61. The respective values for the commercial products Blend-a-med, Lacalut, Theramed and Causamed were between 85 and 95.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4048300 *||Jan 19, 1976||Sep 13, 1977||Colgate-Palmolive Company||Dental preparation containing materials having calcium and phosphate components|
|US4177258 *||Mar 14, 1979||Dec 4, 1979||Colgate Palmolive Company||Dentifrice for dental remineralization|
|US4183915 *||Oct 13, 1978||Jan 15, 1980||Colgate-Palmolive Company||Stable solution for dental remineralization|
|US4327079 *||Oct 29, 1980||Apr 27, 1982||Dental Chemical Co., Ltd.||Dentifrice compositions|
|US4342741 *||Apr 27, 1981||Aug 3, 1982||Dental Chemical Co., Ltd.||Dentifrice compositions|
|US4634589 *||May 7, 1985||Jan 6, 1987||Wurttembergische Parfumerie-Fabrik Gmbh||Dentifrice for hypersensitive teeth|
|DE2134862A1 *||Jul 13, 1971||Jan 25, 1973||Scheller Durodont Dr||Mouth-and dental-care prepns - contg hydroxyl-apatite and/or disinfectants|
|1||*||Koldermann et al., C.A. 78 128425v, (1973), of Ger. Offen. 2134862, 1/25/73.|
|2||Koldermann et al., C.A. 78# 128425v, (1973), of Ger. Offen. 2134862, 1/25/73.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5009898 *||Sep 19, 1989||Apr 23, 1991||Kabushiki Kaisha Sangi||Antimicrobial hydroxyapatite powders and methods for preparing them|
|US5037639 *||May 24, 1989||Aug 6, 1991||American Dental Association Health Foundation||Methods and compositions for mineralizing calcified tissues|
|US5087444 *||Mar 27, 1990||Feb 11, 1992||Beecham Group P.L.C.||Non-fluoride desensitizing mouthwash|
|US5139768 *||Feb 28, 1991||Aug 18, 1992||Yissum Research Development Company Of The Hebrew University Of Jerusalem||Dental composition for hypersensitive teeth|
|US5211939 *||Jan 14, 1992||May 18, 1993||Gillette Canada||Method for desensitizing teeth|
|US5250288 *||Jan 25, 1993||Oct 5, 1993||Gillette Canada, Inc.||Method for desensitizing teeth|
|US5252577 *||Mar 6, 1992||Oct 12, 1993||Gillette Canada, Inc.||Methods of desensitizing teeth|
|US5307353 *||May 7, 1991||Apr 26, 1994||Fujitsu Limited||Fault recovery system of a ring network|
|US5328692 *||Oct 29, 1992||Jul 12, 1994||Dominique Dana||New liquid dentifrice composition|
|US5403577 *||Jun 12, 1992||Apr 4, 1995||Yissum Research Development Company Of The Hebrew University Of Jerusalem||Dental composition for hypersensitive teeth|
|US5437857 *||Aug 9, 1993||Aug 1, 1995||American Dental Association Health Foundation||Methods and compositions for mineralizing and fluoridating calcified tissues|
|US5438076 *||Jan 4, 1993||Aug 1, 1995||Perio Products, Ltd.||Liquid polymer composition, and method of use|
|US5468489 *||Jun 20, 1994||Nov 21, 1995||Sangi Co., Ltd.||Dentifrice containing antibacterial material|
|US5522726 *||Oct 27, 1994||Jun 4, 1996||Hodosh; Milton||Method for anesthetizing teeth|
|US5534244 *||May 6, 1994||Jul 9, 1996||Tung; Ming S.||Methods and compositions for mineralizing and/or fluoridating calcified tissues with amorphous strontium compounds|
|US5648399 *||Apr 25, 1995||Jul 15, 1997||Perio Products, Ltd.||Liquid polymer composition and method of use|
|US5660817 *||Nov 9, 1994||Aug 26, 1997||Gillette Canada, Inc.||Desensitizing teeth with degradable particles|
|US5741479 *||Jun 6, 1995||Apr 21, 1998||Gillette Canada Inc.||Desensitizing teeth with degradable particles|
|US5849266 *||Apr 4, 1995||Dec 15, 1998||Perio Products Ltd.||Dental composition for hypersensitive teeth|
|US6241972||Feb 19, 1999||Jun 5, 2001||Block Drug Company, Inc.||Oral care formulation for the treatment of sensitivity teeth|
|US6919070 *||Oct 17, 1997||Jul 19, 2005||Zakrytoe Aktsionernoe Obschestvo “OSTIM”||Stomatic composition|
|US7919107||Apr 5, 2011||Sudzucker Aktiengesellschaft Mannhein/Ochsenfurt||Method for treating hypersensitive teeth|
|US20040247535 *||Sep 18, 2002||Dec 9, 2004||Taek-Kyun Kang||Oral composition for treating sensitive teeth|
|US20050059731 *||Jun 3, 2004||Mar 17, 2005||Ceramoptec Industries, Inc.||Erythrosin-based antimicrobial photodynamic therapy compound and its use|
|US20100021508 *||Jul 28, 2008||Jan 28, 2010||Stephan Hausmanns||Method for treating hypersensitive teeth|
|US20110117031 *||Jul 16, 2009||May 19, 2011||Stephan Hausmanns||Method for treating hypersensitive teeth|
|EP1731132A1||Oct 10, 2001||Dec 13, 2006||Block Drug Company, Inc.||Dental compositions for hypersensitive teeth|
|WO2008040723A1||Oct 2, 2007||Apr 10, 2008||Fritz Ley||Dental, particularly remineralizing composition, effective for pain sensitive teeth, and dental particles, particularly for said composition|
|U.S. Classification||424/49, 424/52, 424/57, 424/673|
|International Classification||A61Q11/00, A61K8/24, A61K8/00|
|Cooperative Classification||A61Q11/00, A61K8/24|
|European Classification||A61K8/24, A61Q11/00|
|May 28, 1991||FPAY||Fee payment|
Year of fee payment: 4
|Jul 11, 1995||REMI||Maintenance fee reminder mailed|
|Dec 3, 1995||LAPS||Lapse for failure to pay maintenance fees|
|Feb 6, 1996||FP||Expired due to failure to pay maintenance fee|
Effective date: 19951206